Pulley



May 26, 1925.

I C. H. HERTZLER PULLEY Filed ed. 9, 1923 INVENTORW 6. f/Heylzlel",

WITNESSES A TTORNE YS Patented May 26, 1925 UNITED STATES 1,539,791PATENT oFrlce,

CHARLES H. HEFLJZLEE, OF GRACEIVIONT, OKLAHOMA. I

PULLEY.

Application filed Dctoser 9, 1923. Serial .No. 667,578.

ToalZ whom it may concern:

Be it known that I, CHARLEs ii. HERTZ- mm, a citizen of the UnitedStates, and a resident .of Gracemont, in the county of Caddo and Stateof Oklahoma, have invented certain .newan-d useful Improvements inPulleys, of which the following is a specification.

This invention relates in general to pulleys, and moreparticularly tofan pulleys especially adapted for use with internal combustion engines,such as are widely employed on certain types of automobiles.

The object of the invention is to provide a fan pulley which may beeasily and readily assembled with the shaft on which it is rotated, andit is-so securely and firmly held as to insure the elimination of allrattling or vibration and the efficient and effective transmission ofthe torque of the shaft to the pulley.

A further object is to provide, a device of this character and havingthese advantages and capacities, and which is, at the same time,extremely simple and durable in construction, reliable in operation,convenient to assemble, and easy and comparatively inexpensive tomanufacture.

Other objects and advantages reside in certain novel features of theconstruction, combination and arrangement of parts which will behereinafter more fully described and particularly pointed out in theappended claims, reference being had to the accompanying drawingsforming a part of this specification, and in which:

Figure 1 is a fragmentary view partly in elevation and partly in sectionshowing an engine shaft of an automobile, having a fan pulley appliedthereto in accordance with the present invention.

Figure 2 is a perspective view of the fan pulley and its attaching pin.

Referring to the drawings wherein for the sake of illustration is shownthe preferred embodiment of the invention, the numeral 10 designates theengine shaft of an automobile which projects at one end from the casing.The fan belt pulley is designated generally at 11, and preferablyincludes a hub 12 adapted to snugly fit on the shaft 10, a web or bodyportion 18.integral with the hub and a rim 14 integral with the web orbody portion 13.

The rim 14, the hub 12 and the shaft 10 are provided with diametricallyopposed openings, the openings .of the :rim being designate-(lat 15 and16, the openings of the hub being designated at 17 and the opening ofthe shaft being designated at 18. The openings 15, 17 and 18 arepreferably of the same size of-cross section, but the opening 16 ispreferablysmaller than theopenings 15, 17 and 18. p I I An attaching pinor key .20 is provided, and is preferably constructed of a single pieceof resilient metal. While the metal making up the pin 20 is resilient,as will hereinafter be particularly pointed out, it is also sufiicientlyrigid and strongtocarry out its looking or securing functions. The pin20 includes a cylindrical body 21 =of a size to snugly fit, althoughfreelyapass through, .the openings 15, 17 and 18. At oneend the body,portion21 is provided with an integralreduced extension or tenon ,22

which, inthe assembly, is, adapted to snugly.

fit in and to be entirely contained in the opening 16 of the rim of thepulley. ,At the end of the .pinoppositethetenon22, the pin is splitor.cut diametrically for a portion of its longitudinal extent, asindicated at 23, to provide two spring arms 24. These arms are so formedas to normally diverge from each other under the spring or resilientaction of the metal which constitutes the pin. In order to insure thisdiverging relation, it is only necessary to spread the arms to thedesired extent after splitting or cutting op-' eration, but if founddesirable the arms may be also suitably treated after the spreadingoperation. The extremity of each arm is cut away or reduced to provide alocking shoulder 26 and a locking lug 27.

In assembling the pulley on the shaft, the hub of the pulley is slippedonto the end of the shaft and the openings 15, 17 and 18 and 16 arebrought into alinement. The pin 20 is then inserted through the opening15, and passed into the openings 17 and 18. The pin 20 freely moves foralmost its entire length through the opening 15, and until the divergingarms 20 come to the position in which they engage the walls of theopening 15. At this time, a portion of the pin 20 has passed through theopenings 17 and 18, so that the pulley is held on the shaft. The end ofthe pin at which the lugs 27 occur is then tapped with a hammer to drivethe diverging arms 24 of the pin through the opening 15. As thediverging arms 24 are driven through the 1 the opening 15, as well asthrough the openings 17 and 18 is limited by the engagement of theshoulder 19, formed at the juncture of the tenon 22 and body portion 21of the pin, with the inner periphery of the rim 14' of the pulley aroundthe opening 16.

With this arrangement the pulley is held on the shaft securely-andallvibration and rattling is eliminated. At the same time the pulley may beeasily assembled with the shaft and may be taken therefrom by compressing "the arms 24 and urging these arms while so compressed and the,pin through the opening 15. r

I claim:

1. In combination, a shaft, a pulley fitted on the shaft and having ahuband rim, the

hub, rim and shaft having alined openings,

and an attaching pin fitted in the alined openings and having a tenon atone end fitting in one of the openings of the rim, the other end of thepin being provided with diver ing arms havin shoulders engageable withthe rim, an lugs disposed in the other opening of therim.

V 2. In combination, a shaft, a pulley fitted on the shaft and having'ahub and rim, the hub, rim and shaft having alined openings, and anattaching pin fitted in the alined openings and having a tenon at oneend fitting in one of the openings of the rim, the other end of the pinbeing provided withv diverging arms havin gageable with the rim,- anlugs dis osed in the other opening of therim, sai pin being constructedof a'single iece of resilient metal and having one an split to definesaid arms.

3. In combination, a shaft, a pulleyfitted on the. shaft, said shaft andpulley having aligned openings, and an attaching pin of resilientmaterial fitted in the aligned open-Q. ings and having one endsplit, thesplitfend being formed with a reduced extension to provide divergingarms, the end of the pin opposite said arms being engageable withshoulders enthe pulley. to position the arms-in the open! ing of thepulley so that the arms are engaged with the wall of the opening in theassembly, the juncture of the reduced end of the pin andthe mainportionvthereof presentin inner periphery of the pulley in the assemblyfor locking the pin in position.

CHARLES H. HERTZLER;

shoulders engageable with i the,

